From the amount of water sufficient for a 1-person household. For 2 people, especially if you cook with the water and still has a fully automatic coffee machine (and this would also be used for more than one person) - I would recommend the "big ones". We have this one bought our second home - at home, we have the "Big" (the did not exist in the great colors unfortunately at that time ...) Toll I think that for each (color) types there is something, you get currently "all fashion colors". The red is the figure almost similar, a bit brighter in the red-clay, very very chic, I find the original red even more beautiful than the figure. To filter I can only say: We have a lot! hard water, WITHOUT did not work - otherwise we would have the kettle 2 times a week descale. Even our coffee machine is not littered Thanks to the filter after a few days with limescale. The timer is essential and absolutely helpful - because the stress of daily life time goes astray-fast - and you even forget to look at the calendar. All in all: nice part, if you still stylish it - would have ... - match the kitchen color However, one must consider whether one - and it plays a role just how much water you want to filter - not equal to the "Great" attacks. But if you look at (1-2-person household) "only" 1-2 times daily coffee / tea want to do with it - absolutely sufficient. Price / performance ratio ok